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Summary of Significant Accounting Policies - Additional Information (Detail) |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
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Oct. 01, 2023 USD ($) | Oct. 01, 2022 USD ($) Segment | Oct. 01, 2021 USD ($) Segment | Jan. 19, 2021 USD ($) | Oct. 31, 2023 Segment | Aug. 31, 2023 USD ($) | Dec. 31, 2021 USD ($) Facility | Sep. 30, 2021 USD ($) | Jun. 30, 2021 USD ($) Facility Bed | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Unfavorable adjustment for professional and general liability claims |  |  |  |  |  |  |  |  |  | $ 5,300,000 | $ 5,900,000 |
Professional and general liability reserve |  |  |  |  |  |  |  |  |  | 109,400,000 | 103,600,000 |
Professional and general liability reserve current |  |  |  |  |  |  |  |  |  | 12,500,000 | 12,100,000 |
Professional and general liability reserve noncurrent |  |  |  |  |  |  |  |  |  | 96,900,000 | 91,500,000 |
Insurance receivable |  |  |  |  |  |  |  |  |  | 62,300,000 | 37,800,000 |
Insurance receivable - current portion |  |  |  |  |  |  |  |  |  | 33,579,000 | 10,158,000 |
Insurance receivable noncurrent |  |  |  |  |  |  |  |  |  | 28,700,000 | 27,600,000 |
Workers compensation insurance claims deductible per accident |  |  |  |  |  |  |  |  |  | 500,000 |  |
Reserve for workers compensation liability |  |  |  |  |  |  |  |  |  | 26,800,000 | 24,200,000 |
Accrued salaries and benefits |  |  |  |  |  |  |  |  |  | 12,000,000 | 12,000,000.0 |
Other long-term liabilities |  |  |  |  |  |  |  |  |  | 14,800,000 | 12,200,000 |
Depreciation expense |  |  |  |  |  |  |  |  |  | $ 132,300,000 | $ 117,800,000 | $ 106,700,000
Number of beds, replacement facility | Bed |  |  |  |  |  |  |  |  | 260 |  |  |
Non-cash property impairment charge relating to closure of facilities |  |  |  |  |  |  |  | $ 1,100,000 | $ 23,200,000 |  |  |
Impairment of long-lived assets | $ 0 | $ 0 | $ 0 |  |  |  |  |  |  |  |  |
Impairment, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [Extensible Enumeration] | Other operating expenses | Other operating expenses | Other operating expenses |  |  |  |  |  |  |  |  |
Number of reporting units | Segment |  | 1 | 1 |  | 1 |  |  |  |  |  |  |
Number of outpatient | Facility |  |  |  |  |  |  | 1 |  | 1 |  |  |
Proceeds from U.K. Sale |  |  |  |  |  |  | $ 1,500,000 |  | $ 4,300,000 |  |  | $ 1,511,020,000
Goodwill write down |  |  |  |  |  |  | 700,000 |  | 1,800,000 |  |  |
Intangible assets for the disposition |  |  |  |  |  |  | $ 100,000 |  | $ 200,000 |  |  |
Impairment, Intangible Asset, Indefinite-Lived (Excluding Goodwill), Statement of Income or Comprehensive Income [Extensible Enumeration] |  |  |  |  |  |  |  |  |  | Asset Impairment Charges |  |
Non-cash impairment charge related to indefinite-lived assets |  |  |  |  |  |  |  |  |  | $ 5,400,000 |  |
Loss on Impairment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Non-cash property impairment charge relating to closure of facilities |  |  |  |  |  |  |  |  |  | $ 2,000,000 |  |
ASU 2021-10 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] |  |  |  |  |  |  |  |  |  | true |  |
Change in Accounting Principle, Accounting Standards Update, Adoption Date |  |  |  |  |  |  |  |  |  | Dec. 31, 2022 |  |
Discontinued Operations [Member] | U.K. Facilities [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from U.K. Sale |  |  |  | $ 1,525,000,000 |  |  |  |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum self insured professional liability limit per claim |  |  |  |  |  | $ 5,000,000 |  |  |  | $ 7,000,000 |  |
Maximum professional liability aggregate policy limit |  |  |  |  |  | 75,000,000 |  |  |  | $ 78,000,000 |  |
Maximum [Member] | Building and Improvements [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Property plant and equipment estimated useful life |  |  |  |  |  |  |  |  |  | 50 years |  |
Maximum [Member] | Equipment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Property plant and equipment estimated useful life |  |  |  |  |  |  |  |  |  | 7 years |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maximum professional liability retention limit |  |  |  |  |  | 10,000,000 |  |  |  | $ 10,000,000 |  |
Maximum professional liability aggregate policy limit |  |  |  |  |  | $ 70,000,000 |  |  |  | $ 75,000,000 |  |
Minimum [Member] | Building and Improvements [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Property plant and equipment estimated useful life |  |  |  |  |  |  |  |  |  | 10 years |  |
Minimum [Member] | Equipment [Member] |  |  |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Property plant and equipment estimated useful life |  |  |  |  |  |  |  |  |  | 3 years |  |

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